No blast air flow when the blast control is engaged. The water pump cycles while the blast control is engaged.

  • Adjust the blast regulator to the desired pressure while the blast control is engaged.
  • Confirm the tubing from the blast regulator to the main air regulator is intact.  See Hose Schematic in manual for further detail.
  • Replace the blast air regulator.
  • Perform pressure relief procedure.
  • Make sure all of the air pressure is relieved in the unit.  If necessary, remove the air filter for access to the air regulator.
  • Remove the piston cover.
  • Remove the diaphragm cover for access to the dispgragm and to the end of the piston shaft.
  • Remove the diaphragm and inspect for any cracks or tears.  Replace the diapgragm if necessary.
  • Carefully remove the spring and piston assembly, then clean out any debris in the body of the regulator.
  • Inspect the piston and its seal for any foreign matter that may have been the cause for the piston to stay open.
  • Inspect for any damage to the piston shaft where it interacts with the diaphragm cup.  Replace components with excessive wear.